Magnetic backed, thin flexible rubber disc with a hook and loop (velcro type) surface to attach the polishing pads to any steel diamond grinding disc.

Use this only if you have a steel surface like an electroplated diamond grinding disc to use it on.  Use the "bat version" if you are going to use only the polishing pads. 

You can also just get the pads and devise a way to attach them to a wheel yourself.